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Fix: 421 cannot connect to SMTP Server
![Solution] Outlook 421 Cannot Connect to SMTP Server Error](https://www.stellarinfo.com/blog/wp-content/uploads/2021/01/How-to-Fix-Outlook-421-Cannot-Connect-to-SMTP-Server-Error.jpg "Solution] Outlook 421 Cannot Connect to SMTP Server Error")
Solution] Outlook 421 Cannot Connect to SMTP Server Error
Fix: SMTP Error 550 When Sending Email
Test SMTP connection and send test email
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![Server Buld 20303.1] IIS 6 Manager crashes trying to edit SMTP Virtual Server Properties - Microsoft Community Hub](https://techcommunity.microsoft.com/t5/image/serverpage/image-id/264568iCDF7D67953802BA7/image-size/large?v=v2&px=999 "Server Buld 20303.1] IIS 6 Manager crashes trying to edit SMTP Virtual Server Properties - Microsoft Community Hub")